Accounting Pronouncements Adoption of Account Standards Update 2016-16 (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018
Operating lease right-of-use assets	$ 34,838	$ 0	$ 0
Total operating lease liabilities	31,922
Accounting Standards Update 2016-02 [Member]
Operating lease right-of-use assets	36,600
Total operating lease liabilities	$ 34,200